On November 15, 2018, Chad Cuddigan released the source code for Delver under the GNU General Public License version 2. A week later, it was changed to a custom copylefted version of the zlib License. On September 21, 2020, the license was changed to the regular zlib License.
On April 2, 2021, Delver Engine v1.4.0 was released on GitHub. Checksums (SHA-256):